GRP Login Message Fields
The GRP Login message is the first message sent to the GRP by a user's process after the connection to the GRP is established. Failure to login before sending any other message type will result in the connection being dropped by the GRP.
| Field | Offset | Length | Value/Type | Description |
|---|---|---|---|---|
| Length | 0 | 1 | Binary | Length of this message including this field. |
| Message Type | 1 | 1 | 0x01 | GRP Login message |
| SessionSubId | 2 | 4 | Alphanumeric | SessionSubId supplied by Cboe. |
| Username | 6 | 4 | Alphanumeric | Username supplied by Cboe |
| Filler | 10 | 2 | Alphanumeric | (space filled) |
| Password | 12 | 10 | Alphanumeric | Password supplied by Cboe |
| Total Length = 22 bytes | ||||